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Have M-14 .410 upper that I am having trouble with blowing primers. Anybody had experience with this. Is there a gas adjustent? Using Estate ammo
never knew there was a .410 upper made for either an AR 15, or an AR 10 platform.
Since none of the resident AR smiths spoke up, here goes. Check to see if your firing pin is too long, or if the primers might be too soft. also get a different brand of ammo, or try some good reloaded ammo & see if the problem persists.
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